Issue with Seamonkey 2.49.5

[Chuck]

My wife uses Seamonkey 2.49.5 and if she tries to open an attachment as 
well as other files, mainly while in mail, Seamonkey starts flashing on 
and off and each time it opens a new tain Seamonkey until there are 
dozens of tabs open.
While this is going on, task manager cannot be used to close Seamonkey
The only way to stop it is to shut down the computer and reboot.
Please advise.
Thanks,
Chuck
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